Telephone busy-signal apparatus.



G. E. KiMBALL.

TELEPHONE BUSY SHENAL APPARATUS.

APPLICATION FILED SEPT. 19, 1906- v 1,144,33Q. v Patentedlune 22,1915.

2 SHEETS-SHEET I.

@ffiwao 1 W a} i G. E. KIMBALL. TELEPHONE BUSY SIGNAL APPARATUS. APPLICATION man SEPT. 19, 1906.

1,144,339. Patented June 22, 1915.

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i at enterl June 22, 1315.

, npgilicacion filed sle p sneer 1e, semine'seaeee;

UH IUHLWilli/007266772! g j it known that 1, German E. lgib iBA LL, the ,Jnitecl States 9f America,

i of Chicagc, Cock county, Illiinvented a ceriain newiand use- :einen; in Telephone: Busy signal rates. of which the ir'ellowing 'is a line" :11. 1 f k Ly iruc-neion relatesic 'telepl 'onesystems 35 in f nerel. contemplates 211i improyfecl I ling apparatus-,-that isfte say, an

, apps ratus for Supplying the husy- 'rrent "which isi transmittecl in a subscriber Wl'ienever the called line is busy \fizneraliy tabecl he object of my inyenisione 0% an imprcyerl and ousy-s igneling apper'aizus l cre 0i my invention are the a busy-signaling fap'peraius apparatus having a buzzer producing the busy-signal provisien of a hu'Sy-signziling anpara .us ceniprisingenly relays or electremi er 'trgether Wiih suitable connections and con" and condensers; the provision of a pole 'zerl electro-megnet armature having means for intermittently 'interrupcing the bus weignal current so, as to produce abusy- Qg'nm of re relldmown and peculiar charanal the provision of certain details hues of iniprerement and conihinain increase the general effi- 9 eability of an apparatus or -e'wker' feature of inyention.

ale view ofithe" same; Fig. 3 en of tlw-"lourerpart, showing the c "ini-hreakerjpertsi Fig. .Qfi'i'tlfiilifiilfi}"llGW shp'wingthe cir- .ecti0us embodying the principles n. Fig. is a detail View of 1 Shaun in FigSQl and Q.

* mounted on the bracket aaraeter; and adapted: for

nut-breaking device comprises '10 by the screwe 1". The bracket and saddle piece'thus assemhiecl are securely clamped to the permanent in'agnet 12 of the ringer mechanism, as'shown in Figs. 1 and-2. On the front end of the shaft 8 is secured by the set-screw 13 the toothed Wheel 1% by means of'which the shaft is rotated. To the rear end of said shaft is secured the circular bushing 15(Fig. having an elevation or lug 18 which, as the shaft is rotated, bears -26 and screwsQl. To the ringer armature 22 is rivet ed at the point 23 a driving spring arm 24, which latter is suitably provided with a laieral extremity 25 for engaging the eeth of the wheel 1%, and which extremity 'is'normal'ly retained in engagement there- 'Wifih by the tension of the spring arm I Said armature is carried on anrlcrosswise of a torsional spring S, which latter is carried on the yoke T. With this arrangement the armature 22 111 vibrating, when the relay "coils become energized, imparts a tc'and-fro motion to the arm 2%, which latten'when in its advanced position, engages a tooth ot the wheel 14, and on the return stroke of the arm the end 25 rotates theengaging Wheel.

The said wheelie reteinec in'its advanced positionbythe dog or pawl spring 26, which laiter is secured to the shaft bracket 9.

The engagement of the springs 5 and 6 "(Tim 4-}, which may be caused in any suitable" manner, closes an energizing circuit through rhe relay 2? which,'upen energiza- 'ticn, attracts its armature 28, thereby closing in' c'ontect' the generator springs 29 and 30 anti the battery Springs Bland 32. The engagement of the springs 29 ancl30 closes an energizlng circuit from the genera-tor 5 to the relay coils. The mechanism then operates and imparts tcthe shaft 8e rotative motion The engagement of the springs 31 lrnnwn manner) the armatiire 34 that disengages the springs 35 and 36. The energizingcircuit through the buzzer relay 33 extends from ground 9?, springs 35 andf36, through the vincling of the relay 83 to the springs 31 and 32, battery lead 44, thence through battery. I) to ground 9. Furthermore, the alternate make and break contact of the springs 35. and 36 causes the condenser 37 to alternately charge and discharge through the winding 38 of the induction-coil 39. The charging circuit, when the springs 35 and 36 are disengaged, extends from the battery 7) to the springs 32 and 31, through the winding of the relay 33, winding 38 of the induction-coil 39, condenser 37,

resistance-coil 40, springs 17 and 18 to ground 9 thence to the grounded battery terminal g.- Upon the engagement of, the

springs and 36 the said condenser is discharged through 'the winding 38 of the induction-coil 39' to the buzzer relay, springs 3.6 and 35 and to ground 9 As long asthe relay 27 is energized the buzzer relay 33'continues to buzz andthe condenser continues to be charged and discharged, with each 9.1-

ternate opening and closing in contact of the springs 35 and 36, until the charging circuit is temporarily interrupted, when the shaft 8 rotates the bushing 15 and the lug 16 carries the spring 17 from engagement with the spring 18.. Further rotation of the shaft carries the lug 16 from the spring 17, thereof the condenser is momentarily open while the projection 16 is in contact with' the suitable signaling purpose.

Fig. 4, for example, suitablejconnections' by permitting the springs 17 and 18 to again engage, re'stablishing the energizing circuit of the condenser 37. Thus, during each revolution of the shaft 8 the charging circuit i may be made with an automatic telephone system involving connectors of the type shown in United States Patent granted March 13, 1906, to Keith, Erickson ,.& Erickson. In' Fig. l-of the accompanying drawings, and in'Fig. 51 of said patent, corresponding parts of the connector-switch to which the signaling current is taken have corresponding reference numerals, and the difi'erent parts will readily be recognized. Assume that a subscriber of an automatic exchange of the above mentioned type calls onto a busy line, 'and that the connector employed receives the busy release on the last rotary impulse; then when the subscriber presses lllS signaling button, instead of ring-' V ing the desired substation bell; the busv sig nal is received as follows: When the-signaling button is pressed the'fvertical line conductor-is' grounded, which closes an energizi'ng circilit through the vertical line relay. of "the connector. The latter relay closes an'ene- 'curr inte m'ttently and at-a comparatively slow" ergizing circuit'through the vertical magnet which operates in the well known manner to raise the shaft B. The said shaft in rising carries the normal arm 6 from engagement with the'bushing of the spring I) andallows .'the latter to come in contact with the spring Z2 This ngagement closes an energizing circuit through the relay 27 (already explained) extending from ground 9 through the relay winding 27 to the'springs b and 6 side switch wiper Z ringer relay springs 7 and 6, through the winding of the back release relay M to the battery leadae, v Q

' thence through battery b to ground 9. The

relay 27 energizes and operates as previously explained. The charge and discharge of the condenser 37 throughthe primary winding 38 is discontinued for a short interval during each revolution of the bushing 15 when the projection 16 carries the spring 17 out of engagement with the spring 18, thus producing a buzz-buzz current in thejsecondary circuitof the induction-coil 39. From th -eonductor 42 of the winding 41 this current passes to the springs b and 6 side switch wi er-Z rin er rela S)Ii11 s7 and 6 condenser 4 to the conductor 2 of the calling line, through the secondary winding of the induction-coil and receiver of the callinggs' I substation to the conductor 1, through the winding of the vertical line relay 0- to the 1 battery lead :4, springs 32 and a1- and to the conductor 43 of the secondary winding 41. g I

The calling subscriber upon hearing the in-. termittcnt buzz inhis receiver immediately that the desired substation is in service.

The 1 1 nd coils may vbe-ol? an it.

able resistance and it has been found that .10

good results are obtained when'the relay 27 is wound to a resistance of thirteen hundred ohms; buzzer relay 33 five hundred ohms;

resistance-coil 40 five hundred ohms; wind six ohms.

ing as one-half ohm; and winding 41 fifty;

. From the foregoing it will beseen that'I use a polarized electro-magnet arniature'fqr" I actuating the circuit-breaker by which the Z flow of busy-signal current is-intermittently the characteristic or ,Well-knownform o busy-signal. Also,-it -.will be seen that I em-* interrupted for the. purpose of producing i.

ploy anelectric buzzer or interrupter for- P fit usy signal current, which is afterward, as stated, interrupted rate b -the rotation of the shaft 8. 7'Fur-.

thermore, it will be seen that no partyof my improved busy-signaling; apparatus is normally in motiontliat is to'say. the entire}. apparatus is normally at rest. The ringing generator 5 may, of course, be operated con.

stantly, as is the usual practice i telephone exchange systems, butthis generator is only the. regular and usualringing generator,

nal-,1

1oo,.. recognizes the busy signal and understands although snpio sc rareacting at current for operating the suan'creauy can stitutcs no part of the sptciaitcs nigasuag apparatus. With this arranentfil; fin that goodresults are obtalfifid l n sacro- Tho polarizefi armature 22 acaits'operating electr c-magnet Xconstitute", when ernployecl in this manner, an alternating current motor for operatin the switch or circuit-controller by which the, busy-signal current is intermittentlyinterrupted. itwill he soon, of course, that different features and cornhinations of my invention are or may be found-adapted for use "in various connections;

"that 31 claim as my invention is 1. In apparatus of the character sct forth, the combination of means for"'proriucing a current of comparatively rapid variations, a switch for intermittently interrupting the current, a polarized armature connected for operating saicl switch, an electro-magct for vibrating said armature, means tor supplying alternating current of comparatively slower variations for energizing said electro-magnct, and means controlling the operation of said apparatus. I I

2. In apparatus of the character set forth, the combination of means for proclucing a current of comparatively rapi variations, :1 switch for intermittently intemlptiug the current, a torsional spring, a. polarized armature mounted to vibrate against the torsion oi sai spring, means by which the said armature operates the said switch, an electro-niagznet for vibrating said armature, means for supplying alternating current oi" comparatively slower variations for encrgizing said electro-magnet, and means controlling theoperation of said apparatus.

3. In apparatus of the character set forth, the combination of means incluling a buzzzcr or interrupter normally at rest for suplying: a signal current, means infiopcndent of said buzzer for intermittently interruptillfl said signaling current, aml means controlling: the operation of saicl apparatus.

4. in apparatus of the character set forth, the combination of means for proclucing a current of comparatively rspiti variations, :1 switch for intermittently interrupting the current, an alternating current motor for operating; said switch, means for supplying alternating current of comparatively slower variations to said motor, and electromagnctically-opcratecl means for controlling the operation of said alternating current-supplying means.

In apparatus of the character set forth, the combination of a polarized armature, an clectro-magnet for operating said armature, an electric circuit, a switch controlling soul circuit, a rotary shaft for intermittently 0pcrating said switch, connections by which the} sr saas rotats l 2 supply ng 3 cur-rescue :jonergisa ros gnct; anticlcctronaagnctically -opcra ccl ,zuieans forcontrolling the operation cffssaicl i co in -3. i I nomical inlicl highly satisfactory manner. I l

J. soul electrotwin caper-sweet thocha'ractcr set forth,

'thecomhinaition. of an electric switch or circuit-ccntrolling clevice, a ratciictdcrice for intermittently operating said SWl'tCll, a po larizcd'srznature for operating said 1 device, an clectro-magnctforopcrating soul armature, means for supplying current to energize said electro-niagnct, anti electromagnctically operatsdmeans-'1 ior control ling the operation of said; apparati 7. in apparatus of the character forth, the combination of means including an electric buzzer or interrupt/er for producing a current, an energizing circuit for the electro-magnet of said buzzer or interrupter, a relay controlling said circuit, an energizing [circuit for said relay,- an {automatic telephone switch, and means by which said relay cir cult is closed by an ofi-norrnal condition of said automatic switch.

8. In a parstua of the character set iorth, the combination of means including an electric buzzer or interrupter for producing a current, an snor ising circuit for the electro-xnagnct of solo buzzer or interrupter. relay controlling saicl circuit, an energizing circuit for said relay, an automatic telephone switch, means by which said relay circuit is closed by an ri -normal condition of automatic switch, a switch icr interruptin the current, a polarizeti armature, connec tions by which the armature operates tho said switch for intcrrnpting the current, a oublc-corc electro-magnet for operating ssia armature, and an energizing circuit "for said double-core magnet controlled. by said relay.

9. In a paratus of the character set forth, the combination of means including: an cloctric buzzer or interrupter for proclucina; a current, an energizing circuit for the cloctro-rnagnet oi sail'l buzzer or interrupter, a relay controlling Saki circuit. an energizing circuit for said rolay. an automatic icicphone switch, means by which sairi relay circuit is closetl by an oil-normal condition of saicl automatic switch, a switch for irtcrrupting the current, a polarized arrnaturc, connections by which the armature operates the said switch for interrupting the current, a. (louhle-core elcctro-rnagnet for operating said armature, an energizing circuit for said double-core magnet controlled by said relay, and a source of alternating current in the said circuit for energizing the double-core electro-maet.

10. In apparatus of the character set forth, an induction coil, a condenser in circuit with the primary winding oi sail indenser to ground, a buzzer or an interrupter for alternately charging and discharging said condenser to thereby induce an alternating current in the secondary Winding of said induction coil, and means for intermittently interrupting said ground connection.

11. In apparatus of the character set forth, an induction coil, a buzzer or interrupter for intermittently breaking the circuit through the primary winding of said induction coil, and means separate and apart from said interrupter or buzzer for intermittently breaking said circuit through the primary at a second point.

12. In apparatus of the character set forth, an induction coil, a buzzer or interinduce an alternating current in the secondary Winding of said coil, a relay for controlling the operation of said interrupter or buzzer, and means for intermittently interruptin said current at a second point.

13. fn apparatus of the character set forth, an induction coil, a condenser in series with the primary winding of said 'coil, an interrupter or buzzer foralternately charging and discharging said condenser to thereby induce an" alternating current in the secondary winding of said coil, and a relay for controlling the operation of said interrupter or buzzer.

Signed by me at Chicago, Cookrcounty, Illinois, this 15th day .of September, 1906.

GFDRGE E. KIMBALL. \Vitnesses ED\VARD D. FAnns, J. Norman 

